/* Site header + fullscreen menu. Shared by every page. */

.site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1.25rem 6.8rem;
	background: rgba(19, 19, 19, 0.92);
	-webkit-backdrop-filter: blur(8px);
	backdrop-filter: blur(8px);
	font-family: "DM Sans", system-ui, sans-serif;
	font-weight: 300;
	/* Clicking empty space in the bar shouldn't place a text cursor (e.g. beside the burger) */
	-webkit-user-select: none;
	user-select: none;
	caret-color: transparent;
}

.site-logo {
	color: #fafaf8;
	text-decoration: none;
	font-size: 1.0625rem;
	letter-spacing: 0;
}

.menu-toggle {
	position: relative;
	-webkit-tap-highlight-color: transparent;
	caret-color: transparent;
	width: 2.75rem;
	height: 2.75rem;
	margin-right: -0.6rem;
	background: none;
	border: none;
	cursor: pointer;
	color: #fafaf8;
}

.menu-toggle span {
	position: absolute;
	left: 50%;
	width: 1.5rem;
	height: 1px;
	background: currentColor;
	transform-origin: center;
	transition: transform 450ms cubic-bezier(.2, .9, .2, 1), top 450ms cubic-bezier(.2, .9, .2, 1);
}

.menu-toggle span:nth-child(1) {
	top: calc(50% - 4px);
	transform: translateX(-50%);
}

.menu-toggle span:nth-child(2) {
	top: calc(50% + 4px);
	transform: translateX(-50%);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
	top: 50%;
	transform: translateX(-50%) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
	top: 50%;
	transform: translateX(-50%) rotate(-45deg);
}

.menu-toggle:focus-visible {
	outline: 1px solid #7a7a76;
	outline-offset: 2px;
}

.site-menu {
	position: fixed;
	inset: 0;
	z-index: 90;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	padding: 7rem 6.8rem 3rem;
	background: #131313;
	font-family: "DM Sans", system-ui, sans-serif;
	font-weight: 300;
	opacity: 0;
	visibility: hidden;
	transition: opacity 450ms ease, visibility 0s linear 450ms;
	overflow-y: auto;
}

.site-menu.is-open {
	opacity: 1;
	visibility: visible;
	transition: opacity 450ms ease, visibility 0s linear 0s;
}

.site-menu-links {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: 0.9rem;
}

.site-menu-links li {
	opacity: 0;
	transform: translateY(12px);
	transition: opacity 500ms ease, transform 500ms cubic-bezier(.2, .9, .2, 1);
}

.site-menu.is-open .site-menu-links li {
	opacity: 1;
	transform: none;
}

.site-menu.is-open .site-menu-links li:nth-child(2) { transition-delay: 50ms; }
.site-menu.is-open .site-menu-links li:nth-child(3) { transition-delay: 100ms; }
.site-menu.is-open .site-menu-links li:nth-child(4) { transition-delay: 150ms; }
.site-menu.is-open .site-menu-links li:nth-child(5) { transition-delay: 200ms; }
.site-menu.is-open .site-menu-links li:nth-child(6) { transition-delay: 250ms; }

.site-menu-links a {
	color: #7a7a76;
	text-decoration: none;
	font-size: clamp(1.6rem, 4vw, 2.4rem);
	line-height: 1.35;
	transition: color 200ms ease;
}

.site-menu-links a:hover,
.site-menu-links a:focus-visible,
.site-menu-links a[aria-current="page"] {
	color: #fafaf8;
	outline: none;
}

.site-menu-foot {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem 2rem;
	margin-top: 3rem;
	font-size: 1rem;
	color: #7a7a76;
}

.site-menu-foot a {
	color: #c8c8c2;
	text-decoration: none;
}

.site-menu-foot a:hover {
	color: #fafaf8;
}

html.menu-open,
html.menu-open body {
	overflow: hidden;
}

/* Locking scroll unpins a sticky header, so pin it explicitly while the menu is open.
   Without this, opening the menu after scrolling hides the logo and close button. */
html.menu-open .site-header {
	position: fixed;
	left: 0;
	right: 0;
	top: 0;
}

@media (max-width: 768px) {
	.site-header {
		padding: 1rem 2.55rem;
	}

	.site-logo {
		font-size: 1rem;
	}

	.site-menu {
		padding: 6rem 2.55rem 2.5rem;
	}
}

@media (prefers-reduced-motion: reduce) {
	.menu-toggle span,
	.site-menu,
	.site-menu-links li {
		transition: none !important;
	}
}

/* Guard against page-level link styles (e.g. "li a { ... !important }") on case study pages */
.site-menu .site-menu-links li a {
	color: #7a7a76 !important;
	border-bottom: none !important;
	text-decoration: none !important;
}

.site-menu .site-menu-links li a:hover,
.site-menu .site-menu-links li a:focus-visible,
.site-menu .site-menu-links li a[aria-current="page"] {
	color: #fafaf8 !important;
}